Hello laguy, welcome to the site. Are you planning a visit to McFaddin beach before you go? It is a great place to hang out for the day but just be sure to bring everything you will need for your stay as once you drive up the beach, there is no place to get anything. Everyone is pretty friendly, easy place to hangout.
I've been out there during the week only a few times and it was usually only a few vehicles and one day, none at all. On the weekend, it usually gets busy just before noon through the afternoon and sometimes Jeep clubs will come through the area a few times. I don't think there is a normal other than it does get busy on holiday weekends.
I am not (yet) a member of the this board, but starting skinny dippin’ in the Bolivar Peninsula/McFaddin area, and the then-more-remote west end of Galvestion, as long ago as 1980, so, Welcome!
Yes, nude usage has changed, since then. Galveston Island has been developed/infrastructured, and though storms have made the area between High Island and Sabine Pass less-developed, the area that is relatively “safe” for nude use has shrunk to the McFaddin NWR. One must remain remain watchful for law enforcement!